Combining ability effects Vis-a-Vis per se performance in Indian mustard {Brassica juncea (L.) Czern and Coss}

Association between the per se performance and general combining ability effects was higher in F₂ than in F₁ generation which may be attributed to fixation of genes in F₂. Correlation coefficients between per se performance and SCA effects in respect to various traits revealed greater correlation in F₁ than in F₂. It would clearly indicate that per se performance in F₁ was attributable to dominance and dominance based interactions; while it was not so in F₂ suggesting the fixation of the genes thereby accumulating additive genetic effects resulting into superior per se performance. Further, lack of correlation between the SCA effects of F₁ and F₂ clearly showed the non-fixable nature of SCA effects i.e. dominance and dominance based interactions.